US9932037B2 - Method of controlling automotive smart cruise control system - Google Patents

Method of controlling automotive smart cruise control system Download PDF

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Publication number
US9932037B2
US9932037B2 US15/350,502 US201615350502A US9932037B2 US 9932037 B2 US9932037 B2 US 9932037B2 US 201615350502 A US201615350502 A US 201615350502A US 9932037 B2 US9932037 B2 US 9932037B2
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vehicle
speed
stopped
controller
cruise control
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US20180065628A1 (en
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Seong Wook Moon
Jae Hoon Cho
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Hyundai Motor Co
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Hyundai Motor Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/14Adaptive cruise control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/14Adaptive cruise control
    • B60W30/143Speed control
    • B60W30/146Speed limiting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/44Series-parallel type
    • B60K6/442Series-parallel switching type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00Electrodynamic brake systems for vehicles in general
    • B60L7/10Dynamic electric regenerative braking
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
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    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60W20/00Control systems specially adapted for hybrid vehicles
    • B60W20/10Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/13Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
    • B60W20/14Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion in conjunction with braking regeneration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/02Control of vehicle driving stability
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/14Adaptive cruise control
    • B60W30/16Control of distance between vehicles, e.g. keeping a distance to preceding vehicle
    • B60W30/17Control of distance between vehicles, e.g. keeping a distance to preceding vehicle with provision for special action when the preceding vehicle comes to a halt, e.g. stop and go
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18Propelling the vehicle
    • B60W30/18009Propelling the vehicle related to particular drive situations
    • B60W30/18027Drive off, accelerating from standstill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18Propelling the vehicle
    • B60W30/18009Propelling the vehicle related to particular drive situations
    • B60W30/18054Propelling the vehicle related to particular drive situations at stand still, e.g. engine in idling state
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18Propelling the vehicle
    • B60W30/18009Propelling the vehicle related to particular drive situations
    • B60W30/18109Braking
    • B60W30/18127Regenerative braking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105Speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/06Hill holder; Start aid systems on inclined road
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00Further aspects of brake control systems not otherwise provided for
    • B60T2270/60Regenerative braking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2720/00Output or target parameters relating to overall vehicle dynamics
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    • B60W2720/103Speed profile
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00Purposes or special features of road vehicle drive control systems
    • B60Y2300/14Cruise control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
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    • B60Y2302/00Responses or measures related to driver conditions
    • B60Y2302/05Leading to automatic stopping of the vehicle
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/62Hybrid vehicles

Definitions

  • the present disclosure relates to a method of controlling an automotive smart cruise control system and, more particularly, to a method of controlling an automotive smart cruise control system that maintains a vehicle in a stopped state even without an electronic braking system.
  • An automotive smart control system which automatically adjusts the speed of a vehicle to allow the vehicle to automatically travel (cruise) at a speed within a desired range, continuously drives a vehicle at a desired speed, and thus, fuel efficiency and driver convenience are improved.
  • the vehicle may not be maintained in a stopped state (e.g., with a speed of 0) when the vehicle is stopped in accordance with the driving situation of the vehicle, thus requiring a brake pedal to remain engaged to stop the vehicle.
  • the cruise control function is stopped, thus requiring the driver to engage the accelerator pedal to start the vehicle again.
  • the automotive smart control system is active, the engagement of a brake pedal releases the automatic cruise driving of the vehicle. Once the control is released, the brake pedal requires engagement to stop the vehicle and the accelerator pedal is required to be engaged to then continue driving the vehicle.
  • a smart cruise control system is capable of maintaining a vehicle stopped by operating an electronic parking brake (EPB) after the vehicle is stopped. Accordingly, the cruise control function is maintained even after a vehicle is stopped, and thus, the vehicle is capable of being restarted (e.g., driven again) even without requiring the engagement of the accelerator pedal.
  • the smart cruise control system requires the additional EPB to maintain the vehicle in a stopped state, thus significantly increasing the cost of manufacturing the vehicle.
  • the present disclosure provides a method of controlling an automotive smart cruise control system that maintains a vehicle is a stopped state even without requiring an electronic braking system.
  • a method of controlling an automotive smart cruise control system may include: stopping, by a controller, a vehicle when conditions for stopping the vehicle are satisfied based on the driving situation of the vehicle while the vehicle is in a cruise control mode; and maintaining, by the controller, the vehicle stopped by setting the speed of a driving motor to zero when the vehicle is stopped.
  • the vehicle may be stopped by regenerative braking when the vehicle speed is a predetermined speed or greater.
  • the vehicle may be stopped through electronic stability control (ESC) when the vehicle speed is less than the predetermined speed, and the ESC may be stopped and the vehicle may remain stopped.
  • the controller may be configured to start the vehicle by increasing the speed of the driving motor.
  • a vehicle since a vehicle is maintained in a stopped state by maintaining the speed of the vehicle at zero, it may be possible to achieve the unique smart cruise control function of a smart cruise control system even without requiring an electronic braking system, thereby increasing the price competitiveness of the vehicle. Further, since it may be possible to maintain the smart cruise control function even after a vehicle is stopped, the pedal operation is reduced, to thus allow the driver to drive the vehicle more conveniently.
  • FIG. 1 is a diagram showing the structure of a powertrain for a hybrid vehicle to which the present disclosure can be applied according to an exemplary embodiment of the present disclosure
  • FIG. 2 is a flowchart illustrating a process of smart cruise control according to an exemplary embodiment of the present disclosure.
  • FIG. 3 is a diagram schematically showing a smart cruise control system according to an exemplary embodiment of the present disclosure.
  • vehicle or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, combustion, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
  • motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, combustion, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
  • SUV sports utility vehicles
  • plug-in hybrid electric vehicles e.g. fuels derived from resources other than petroleum
  • controller/control unit refers to a hardware device that includes a memory and a processor.
  • the memory is configured to store the modules and the processor is specifically configured to execute said modules to perform one or more processes which are described further below.
  • control logic of the present invention may be embodied as non-transitory computer readable media on a computer readable medium containing executable program instructions executed by a processor, controller/control unit or the like.
  • the computer readable mediums include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards and optical data storage devices.
  • the computer readable recording medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion, e.g., by a telematics server or a Controller Area Network (CAN).
  • a telematics server or a Controller Area Network (CAN).
  • CAN Controller Area Network
  • a method of controlling an automotive smart cruise control system of the present disclosure may include a stop control step and a stop maintenance control step.
  • a controller 3 may be configured to stop the vehicle or decrease the vehicle speed without user input.
  • the speed and the distance from a preceding vehicle may be measured using a radar sensor mounted on the front of a vehicle.
  • the vehicle may be driven to maintain a predetermined distance from the preceding vehicle by appropriately adjusting the vehicle speed based on the measured information.
  • a torque calculator 5 of the controller 3 may be configured to calculate the necessary reduction cruise torque for deceleration and the calculated necessary reduction cruise torque may be transmitted to the controller 3 .
  • the controller 3 may then be configured to stop the vehicle by operating the brake system to correspond to the reduction cruise torque, thereby decreasing the vehicle speed.
  • the controller 3 may be configured to maintain the vehicle in the stopped state by setting the speed of the driving motor 1 to zero.
  • FIG. 1 shows an exemplary structure of a powertrain within a hybrid vehicle to which the present disclosure may be applied, in which HSG is an acronym of ‘Hybrid Starter Generator’.
  • HSG is an acronym of ‘Hybrid Starter Generator’.
  • the speed of the driving motor 1 may also be maintained at zero.
  • the vehicle since the vehicle may be maintained in the stopped state by maintaining the speed of the driving motor 1 at zero, the vehicle is prevented from sliding backwards, for example, down an inclined road, even though a braking pedal remains disengaged (e.g., no pressure is exerted onto the pedal). Accordingly, it may be possible to achieve the particular smart cruise control function of a smart cruise control system even without the requirement of the electronic braking system, thus increasing the price competitiveness of the vehicle. Further, it may be possible to minimize the required user engagement of a pedal by maintaining the smart cruise control function even after a vehicle is stopped, and thus, user convenience may be improved.
  • the stop control step of the present disclosure it may be possible to stop a vehicle through regenerative braking when the current vehicle speed is a predetermined speed or greater.
  • electricity is generated by regenerative braking while a vehicle is stopped, and the electric energy for operating the driving motor 1 is recovered, thereby improving the fuel efficiency of the vehicle.
  • the stop control step of the present disclosure when the current vehicle speed is less than a predetermined speed, the vehicle may be stopped through electronic stability control (ESC).
  • ESC electronic stability control
  • the ESC may be stopped while maintaining the vehicle is the stopped state.
  • ESC may be initiated by the controller to stop the vehicle. Once the vehicle is stopped, the vehicle may remain in the stopped state by stopping ESC and reducing the speed of the driving motor 1 to zero.
  • the controller 3 may be configured to start the vehicle by increasing the speed of the driving motor 1 from zero. For example, when a vehicle is started and the distance from the preceding vehicle increases, the vehicle speed is required to be increased to thus maintain the desired cruise control. Accordingly, the torque calculator 5 may be configured to calculate the necessary acceleration cruise torque for starting and accelerating the vehicle and transmit the calculated necessary acceleration cruise torque to the controller 3 . The controller 3 may then be configured to increase the speed of the driving motor 1 to a speed that corresponds to the necessary acceleration torque to thus accelerate the vehicle. In other words, by maintaining the smart cruise control function active even after a vehicle is stopped, it may be possible for a driver to start the vehicle even without operating the accelerator pedal, and accordingly, the convenience of the driver may be improved.
  • a smart cruise control function may first be started or engaged (S 10 ), the vehicle speed may be detected by a sensor when a stop condition is satisfied while a vehicle is being driven (S 20 ).
  • the vehicle speed is detected to be a predetermined speed or greater, the vehicle may be stopped by regenerative braking (S 30 ), whereas, when the vehicle speed is less than the predetermined speed, the vehicle may be stopped by starting ESC (S 40 ).
  • a vehicle since a vehicle may be maintained in a stopped state by maintaining the speed of the vehicle 1 at zero, it is possible to achieve the particular smart cruise control function of a smart cruise control system without requiring an additional electronic braking system, thereby increasing the price competitiveness of the vehicle. Further, since the smart cruise control function may be maintained active after the vehicle is stopped, the operation of an accelerator pedal by the driver is minimized, thus increasing driver convenience.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

A method of maintain an automotive smart cruise control system is provided. The system is capable of maintaining a vehicle in a stopped state without requiring an electronic braking system. The vehicle is stopped by a controller when conditions for stopping the vehicle are satisfied based on the driving situation of the vehicle, and the vehicle is maintained in the stopped state by setting the speed of the driving motor to zero.

Description

CROSS REFERENCE TO RELATED APPLICATION
The present application claims priority to Korean Patent Application No. 10-2016-0113743, filed Sep. 5, 2016, the entire contents of which is incorporated herein for all purposes by this reference.
BACKGROUND Field of the Disclosure
The present disclosure relates to a method of controlling an automotive smart cruise control system and, more particularly, to a method of controlling an automotive smart cruise control system that maintains a vehicle in a stopped state even without an electronic braking system.
Description of the Related Art
An automotive smart control system, which automatically adjusts the speed of a vehicle to allow the vehicle to automatically travel (cruise) at a speed within a desired range, continuously drives a vehicle at a desired speed, and thus, fuel efficiency and driver convenience are improved. However, according to this cruise control function, the vehicle may not be maintained in a stopped state (e.g., with a speed of 0) when the vehicle is stopped in accordance with the driving situation of the vehicle, thus requiring a brake pedal to remain engaged to stop the vehicle. Further, when a driver engages the brake pedal, the cruise control function is stopped, thus requiring the driver to engage the accelerator pedal to start the vehicle again. In other words, when the automotive smart control system is active, the engagement of a brake pedal releases the automatic cruise driving of the vehicle. Once the control is released, the brake pedal requires engagement to stop the vehicle and the accelerator pedal is required to be engaged to then continue driving the vehicle.
Meanwhile, a smart cruise control system is capable of maintaining a vehicle stopped by operating an electronic parking brake (EPB) after the vehicle is stopped. Accordingly, the cruise control function is maintained even after a vehicle is stopped, and thus, the vehicle is capable of being restarted (e.g., driven again) even without requiring the engagement of the accelerator pedal. However, the smart cruise control system requires the additional EPB to maintain the vehicle in a stopped state, thus significantly increasing the cost of manufacturing the vehicle.
The description provided above as a related art of the present disclosure is merely for helping understanding the background of the present disclosure and should not be construed as being included in the related art known by those skilled in the art.
SUMMARY
Accordingly, the present disclosure provides a method of controlling an automotive smart cruise control system that maintains a vehicle is a stopped state even without requiring an electronic braking system.
According to one aspect of the present disclosure, a method of controlling an automotive smart cruise control system may include: stopping, by a controller, a vehicle when conditions for stopping the vehicle are satisfied based on the driving situation of the vehicle while the vehicle is in a cruise control mode; and maintaining, by the controller, the vehicle stopped by setting the speed of a driving motor to zero when the vehicle is stopped.
Particularly, the vehicle may be stopped by regenerative braking when the vehicle speed is a predetermined speed or greater. Additionally, the vehicle may be stopped through electronic stability control (ESC) when the vehicle speed is less than the predetermined speed, and the ESC may be stopped and the vehicle may remain stopped. When conditions for starting the vehicle are satisfied based on the driving situation of the vehicle, the controller may be configured to start the vehicle by increasing the speed of the driving motor.
According to the present disclosure, since a vehicle is maintained in a stopped state by maintaining the speed of the vehicle at zero, it may be possible to achieve the unique smart cruise control function of a smart cruise control system even without requiring an electronic braking system, thereby increasing the price competitiveness of the vehicle. Further, since it may be possible to maintain the smart cruise control function even after a vehicle is stopped, the pedal operation is reduced, to thus allow the driver to drive the vehicle more conveniently.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a diagram showing the structure of a powertrain for a hybrid vehicle to which the present disclosure can be applied according to an exemplary embodiment of the present disclosure;
FIG. 2 is a flowchart illustrating a process of smart cruise control according to an exemplary embodiment of the present disclosure; and
FIG. 3 is a diagram schematically showing a smart cruise control system according to an exemplary embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DISCLOSURE
It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, combustion, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
Although exemplary embodiment is described as using a plurality of units to perform the exemplary process, it is understood that the exemplary processes may also be performed by one or plurality of modules. Additionally, it is understood that the term controller/control unit refers to a hardware device that includes a memory and a processor. The memory is configured to store the modules and the processor is specifically configured to execute said modules to perform one or more processes which are described further below.
Furthermore, control logic of the present invention may be embodied as non-transitory computer readable media on a computer readable medium containing executable program instructions executed by a processor, controller/control unit or the like. Examples of the computer readable mediums include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards and optical data storage devices. The computer readable recording medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion, e.g., by a telematics server or a Controller Area Network (CAN).
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/of” includes any and all combinations of one or more of the associated listed items.
Exemplary embodiments of the present disclosure will be described hereafter in detail with reference to the accompanying drawings.
A method of controlling an automotive smart cruise control system of the present disclosure may include a stop control step and a stop maintenance control step. Referring to FIGS. 2 and 3, which describe the present disclosure in detail, first, when the conditions for stopping the vehicle are satisfied based on the driving situation of the vehicle, a controller 3 may be configured to stop the vehicle or decrease the vehicle speed without user input.
For example, when a smart cruise control function is engaged (e.g., entry input or engaged received from a user input), the speed and the distance from a preceding vehicle may be measured using a radar sensor mounted on the front of a vehicle. Thus, the vehicle may be driven to maintain a predetermined distance from the preceding vehicle by appropriately adjusting the vehicle speed based on the measured information. When the speed of the vehicle is to be decreased (e.g., the vehicle is to be stopped), based on the distance from the preceding vehicle, a torque calculator 5 of the controller 3 may be configured to calculate the necessary reduction cruise torque for deceleration and the calculated necessary reduction cruise torque may be transmitted to the controller 3. The controller 3 may then be configured to stop the vehicle by operating the brake system to correspond to the reduction cruise torque, thereby decreasing the vehicle speed.
Furthermore, once the vehicle is stopped (e.g., the vehicle speed is 0), the controller 3 may be configured to maintain the vehicle in the stopped state by setting the speed of the driving motor 1 to zero. For example, FIG. 1 shows an exemplary structure of a powertrain within a hybrid vehicle to which the present disclosure may be applied, in which HSG is an acronym of ‘Hybrid Starter Generator’. In FIG. 3, when the speed of a driving motor 1 decreases to zero and the necessary cruise torque, calculated by the torque calculator 5, decreases to zero due to the deceleration of the vehicle, the speed of the driving motor 1 may also be maintained at zero.
According to this configuration, since the vehicle may be maintained in the stopped state by maintaining the speed of the driving motor 1 at zero, the vehicle is prevented from sliding backwards, for example, down an inclined road, even though a braking pedal remains disengaged (e.g., no pressure is exerted onto the pedal). Accordingly, it may be possible to achieve the particular smart cruise control function of a smart cruise control system even without the requirement of the electronic braking system, thus increasing the price competitiveness of the vehicle. Further, it may be possible to minimize the required user engagement of a pedal by maintaining the smart cruise control function even after a vehicle is stopped, and thus, user convenience may be improved.
Referring to FIGS. 2 and 3, in the stop control step of the present disclosure, it may be possible to stop a vehicle through regenerative braking when the current vehicle speed is a predetermined speed or greater. In other words, electricity is generated by regenerative braking while a vehicle is stopped, and the electric energy for operating the driving motor 1 is recovered, thereby improving the fuel efficiency of the vehicle. Further, in the stop control step of the present disclosure, when the current vehicle speed is less than a predetermined speed, the vehicle may be stopped through electronic stability control (ESC).
Further, after the stop control step, the ESC may be stopped while maintaining the vehicle is the stopped state. In other words, when the vehicle is being driven at a speed where regenerative braking is not possible to stop the vehicle, ESC may be initiated by the controller to stop the vehicle. Once the vehicle is stopped, the vehicle may remain in the stopped state by stopping ESC and reducing the speed of the driving motor 1 to zero.
Further, according to the present disclosure, when conditions for starting a vehicle are satisfied based on the driving situation of the vehicle after the stop maintenance control, the controller 3 may be configured to start the vehicle by increasing the speed of the driving motor 1 from zero. For example, when a vehicle is started and the distance from the preceding vehicle increases, the vehicle speed is required to be increased to thus maintain the desired cruise control. Accordingly, the torque calculator 5 may be configured to calculate the necessary acceleration cruise torque for starting and accelerating the vehicle and transmit the calculated necessary acceleration cruise torque to the controller 3. The controller 3 may then be configured to increase the speed of the driving motor 1 to a speed that corresponds to the necessary acceleration torque to thus accelerate the vehicle. In other words, by maintaining the smart cruise control function active even after a vehicle is stopped, it may be possible for a driver to start the vehicle even without operating the accelerator pedal, and accordingly, the convenience of the driver may be improved.
Hereinafter, a process of controlling a smart cruise control system according to the present disclosure is described. The process described herein below may be executed by a controller which may be an upper or overall controller of the system. Referring to FIG. 2, a smart cruise control function may first be started or engaged (S10), the vehicle speed may be detected by a sensor when a stop condition is satisfied while a vehicle is being driven (S20). When the vehicle speed is detected to be a predetermined speed or greater, the vehicle may be stopped by regenerative braking (S30), whereas, when the vehicle speed is less than the predetermined speed, the vehicle may be stopped by starting ESC (S40).
Thereafter, whether the necessary cruise torque is zero may be detected (S50), and when the necessary cruise torque is determined to be zero, the speed of the driving motor 1 may be maintained at zero, whereby the vehicle remains in a stopped state (S60). Thereafter, whether the necessary cruise torque has increased to greater than zero and whether the conditions for starting the vehicle are satisfied may be detected (S70), and when the conditions for starting are satisfied, the speed of the driving motor 1 may be increased (e.g., from zero) (S80) and the vehicle may be started or accelerated by the cruise control function (S10).
As described above, according to the present disclosure, since a vehicle may be maintained in a stopped state by maintaining the speed of the vehicle 1 at zero, it is possible to achieve the particular smart cruise control function of a smart cruise control system without requiring an additional electronic braking system, thereby increasing the price competitiveness of the vehicle. Further, since the smart cruise control function may be maintained active after the vehicle is stopped, the operation of an accelerator pedal by the driver is minimized, thus increasing driver convenience.
Although an exemplary embodiment of the present disclosure has been described for illustrative purposes, those skilled in the aft will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as disclosed in the accompanying claims.

Claims (6)

What is claimed is:
1. A method of controlling an automotive smart cruise control system, comprising:
stopping, by a controller, a vehicle when a condition for stopping the vehicle is satisfied based on a driving situation of the vehicle while the vehicle is in a cruise control mode; and
maintaining, by the controller, the vehicle stopped by setting a speed of a driving motor to zero when the vehicle is stopped,
wherein the vehicle is stopped through electronic stability control (ESC) when the vehicle, speed is less than a predetermined speed, and the ESC is stopped and the vehicle remains stopped.
2. The method of claim 1, wherein the vehicle is stopped by regenerative braking when a vehicle speed is the predetermined speed or greater.
3. The method of claim 1, wherein when a condition for starting the vehicle is satisfied based on a driving situation of the vehicle, and the controller is configured to start the vehicle by increasing the speed of the driving motor from zero.
4. A method of controlling a smart cruise control system, comprising:
engaging, by a controller, the smart cruise control system;
detecting, by the controller, a speed of a vehicle when a stop condition is satisfied while the vehicle is being driven;
stopping, by the controller, the vehicle based on the detected speed of the vehicle;
detecting, by the controller, whether a necessary cruise torque is zero; and
maintaining, by the controller, a speed of a driving motor at zero when the necessary cruise torque is detected to be zero to maintain the vehicle in a stopped state,
wherein when the speed of the vehicle is detected to be less than a predetermined speed, the vehicle is stopped by starting an electronic stability control.
5. The method of claim 4, wherein when the speed of the vehicle is detected to be the predetermined speed or greater, the vehicle is stopped by regenerative braking.
6. The method of claim 4, further comprising:
detecting, by the controller, whether the necessary cruise torque has increased to greater than zero and whether conditions for starting the vehicle are satisfied; and
increasing, by the controller, the speed of the driving motor when the conditions for starting the vehicle are satisfied to accelerate the vehicle by a cruise control function.
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